The Lost Atomic Update on Loongson CPU

发生了什么

In February 2026, Wang Miao ran into something strange while packaging normaliz for Debian on a LoongArch server: the math software's built-in test kept timing out, stuck in an infinite loop that it could not escape. Following the code, the problem pointed to a very ordinary operation: OpenMP's #pragma omp atomic accumulating into a shared variable. The loop's exit condition required the accumulated value to equal a…

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时间线

1. 08:36
   Hacker News 最先出现HHacker News
2. 18:44
   Lobsters 出现讨论LLobsters

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